A study of QCD coupling constant from fixed target deep inelastic measurements

We reanalyze deep inelastic scattering data of BCDMS Collaboration by including proper cuts of ranges with large systematic errors. We perform also the fits of high statistic deep inelastic scattering data of BCDMS, SLAC, NM and BFP Collaborations taking the data separately and in combined way and find good agreement between these analyses. We extract the values of the QCD coupling constant αs(M 2 Z) up to NLO level. The fits of the combined data for the nonsinglet part of the structure function F2 predict the coupling constant value αs(M 2 Z) = 0.1174 ± 0.0007 (stat) ±0.0019 (syst) ±0.0010 (normalization). The fits of the combined data for both: the nonsinglet part of F2 and the singlet one, lead to the values αs(M 2 Z) = 0.1177±0.0007 (stat) ±0.0021 (syst) ±0.0009 (normalization). Both above values are in very good agreement with each other.